Basically we did an experiment where a roller disc was rolled down 2 rails and we had to calculate how long it takes to get from one end to the other, it was raised at 10cm increments each time and obviously the higher the gradient the quicker it got to the bottom.

we then have to calculate things such as radius of gyration, kinetic energy, potential energy and kinetic energy of rotation. now in one of the tables there is values given as S (m) - this is the distance of the rails

t (s) - Time in seconds

v (m/s) - velocity

v^2 (m/s^2) - ?

h (m) - height

i am also given a statement that says

the final linear velocity v is found from s = 1/2(u+v)t

now i have transposed this to 2s/t - u = v but how do i find v^2?